elasticsearch-6.2.2启动后CURL请求后报 master_not_discovered_exception错误

环境说明：
192.168.33.10  master  
192.168.33.11  master data   
192.168.33.12  master data 
 
配置文件：
     192.168.33.10：
         cluster.name: my-application
         node.name: node-10
        transport.host: localhost
        transport.tcp.port: 9300
       network.host: 192.168.33.10
       http.port: 9200
      discovery.zen.ping.unicast.hosts: ["192.168.33.10","192.168.33.11",'192.168.33.12']
      discovery.zen.minimum_master_nodes: 2
     gateway.recover_after_nodes: 3
    node.master: true
    node.data: false
    node.ingest: false
    search.remote.connect: false
 
 
 
 
192.168.33.11：      
        cluster.name: my-application
         node.name: node-11
        transport.host: localhost
        transport.tcp.port: 9300
       network.host: 192.168.33.11
       http.port: 9200
       discovery.zen.ping.unicast.hosts: ["192.168.33.10","192.168.33.11",'192.168.33.12']
      discovery.zen.minimum_master_nodes: 2
      gateway.recover_after_nodes: 3
     node.master: true
     node.data: true
     node.ingest: false
     search.remote.connect: false
 
 
192.168.33.12：
        cluster.name: my-application
         node.name: node-12
        transport.host: localhost
        transport.tcp.port: 9300
       network.host: 192.168.33.12
       http.port: 9200
       discovery.zen.ping.unicast.hosts: ["192.168.33.10","192.168.33.11",'192.168.33.12']
      discovery.zen.minimum_master_nodes: 2
      gateway.recover_after_nodes: 3
     node.master: true
     node.data: true
     node.ingest: false
     search.remote.connect: false
 [root@localhost ~]# curl http://192.168.33.10:9200/_cat/master?v
{"error":{"root_cause":[{"type":"master_not_discovered_exception","reason":null}],"type":"master_not_discovered_exception","reason":null},"status":503}[root@localhost ~]#